弦长计算公式已知弦长30 弧长32.3,求圆心角及元半径

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已知弦长L=30 弧长C=32.3,求圆心角A及圆半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=20R1=22.862
R2=24.21
R3=24.434
R4=24.439
R5=24.439
R=24.439
A=C/R =32.3/24.439
=1.32166弧度
=1.32166*180/PI
=75.725度